Improved cylinder for grain scouring and thrashing machines



J. A. WELSH.

Thrashing' Machine Cylinder.

Pafented March 4, .1862.

UNITED STATES PATENT OFFICE.

JAMES A. \VELSH, OF XENIA, OHIO, ASSIGNOR TO HIMSELF AND R. MC. C.

' DAVIDSON, OF SAME PLACE.

IMPROVED CYLINDER FOR GRAIN SCOURING AND THRASHING MACHINES.

Specification forming part of Letters Patent No. 34,617, dated March 4., 1862.

To all whom it may concern:

Be it known that I, JAMES A. WELSH, of Xenia, in the county of Greene and State of Ohio, have invented a new and useful Improvement in the Construction of Cylinders for Grain Thrashing and Securing Machines; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 is a detached inner or face View of a portion of the cylinder constructed or cast according to my invention; Fig. 2, a detached outer or face view of a portion of the same; Fig. 3, a vertical section of the same, taken in the line w so, Fig. 2; Fig. 4, a horizontal section of the same in the mold, taken in the line 'y y, Fig. 2; Fig. 5, a detached horizontal section of one of the teeth of the cylinder, taken in the line z .2, Fig. 1.

. Similar letters of reference indicate corresponding parts in the several figures.

This invention consists in casting the cylinder with a chill at its outer side, as hereinafter fully shown and described, whereby a very desirable cylinder is obtained and one which will be kept in constant working order by use, the wear of the soft portion of the cylindeflcausing the hard outer edges to be kept sharp or prominent.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A represents a portion of a cylinder which is composed of a series of vertical teeth a, of trilateral form in their horizontal section and connected at their upper ends to a rim b, the rim and teeth being cast in one piece. Spaces 0 of a suitable width are allowed between the teeth a, and the cylinder when of small dimensions may be cast in one entire piece. Cylinders of large size may be cast in sections and the sections secured together by bolts arranged in any proper way.

The cylinder is cast with a chill B at its outer side, the inner side being in contact with sand C, as shown in Fig. 4.

The outer side of the cylinder A, it will be H seen, comprises two sides or faces cl cl of each tooth a, while the inner side comprises one surface or side 6 of each tooth. The inner sides e, in consequence of being cast in contact with sand, have comparatively a soft surface; but the outer sides d d have a hard surface in consequence of being cast in contact with the chill or metal 13.

The cylinder A is arranged and used precisely like those cast in the ordinary way, an internal beater being placed Within the cylinder and the grain brought in contact with the soft sides 6 of the teeth a. It will be seen, therefore, that the soft sides 6 of the teeth will wear concave or hollowing under the action of the grain, and the edges of the hard outer sides 02 d will consequently be kept sharp or angular. (See Fig. 5.)

It will be seen that the cylinder may be termed self-sharpening, as use keeps it in perfect Working order, whereas the cylinders castin the ordinary way-that is to say, in an entire sand-mold without achillhave the edges of the sides cl d of the teeth soon worn rounding and are rendered very inefficient.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A cylinder A, foragrain thrashing 0r scour ing machine provided with trilateral-shaped teeth, and having its outer side cast with a chill B, as and for the purpose set forth.

JAMES A. WELSH. Witnesses:

JAMES L. BARDON, R. PARTINGTON. 

